I don't think the Park FR4 do fit over. Maybe sometimes if you're really lucky. The old Phil Wood tools would fit over Campy locknuts, but the sides were paper thin, and the tools would fail on occasion because of it. I still have a Phil but I'm very careful with it, and frankly it's used only very rarely these days.

Anyway, in practice it usually didn't matter if you had to take off the locknuts, cuz typically if you were taking the freewheel off you were repacking the hub anyway. Leave the other side together and readjust from the drive side when the bearings are repacked.